摘要:
                                In order to investigate new antiulcer agents, spizofurone 1 (AG-629) was fragmented and reassembled to generate 5-phenyl-2,2-dimethyl-3(2H)-furanone (bullatenone, 2).  Because of the antiulcer activity of 2,5-phenyl-substituted 2,2-dimethyl-3(2H)-furanones (3-6) were made and shown to have poor activity.  Insertion of an ethenyl link between the furanone and phenyl rings gave 5-(2-phenylethenyl)-2,2-dimethyl-3(2H)-furanone (7).  This compound had better activity than 2.  Compounds 8-41 were synthesized to evaluate the SAR in 5-(2-ethenyl substituted)-3(2H)-furanones.  Electron-withdrawing substituents on the aromatic ring (8, 10, 19, and 20) gave 2-3-fold higher activity.  Further increases in the activity were found when the phenyl ring was replaced by heterocyclic nuclei.  Compounds that contained a thiophene (29), pyridine (24-26), or quinoline ring (32) had the best activity.  Replacement of the methyl group on the furanone ring with a phenyl (34) or p-fluorophenyl (40) substituent in the 2-pyridine series gave compounds with activity that ranked with the best obtained in this study.  The best compounds from the above SAR studies were evaluated in the ethanol-necrosis model for duration of cytoprotection action.  Compounds 19, 24, and 29, which had the best duration of action, were tested with AG-629 in the acidified aspirin and indomethacin-induced lesion models.  Only compound 24 had equivalent activity with AG-629 in both models.